
When you ask "What number is halfway between 5 and 20?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=5 and Y=20.

To find the number halfway between 5 and 20, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 5 and 20 into our formula, we get:
(5 + 20)/2 = 12.5
Thus, the number halfway between 5 and 20 is 12.5.
To check that our answer is correct, we subtract 5 from 12.5 and subtract 12.5 from 20 and compare the two numbers:
12.5 - 5 = 7.5
20 - 12.5 = 7.5
As you can see, the halfway number is 7.5 higher than 5 and 7.5 lower than 20. Therefore, our halfway between answer of 12.5 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 5 and 21
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